As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PHL ORD-PHL FLT 856. DURING DESCENT TO PHL THE CAPTAIN DECLARED AN EMERGENCY WITH ATC, RECEIVED A FAULT MESSAGE ON EICAS THAT THE OUTBOARD BRAKES ARE COLD AND THE INBOARD BRAKES ARE AMBER. THE FLIGHT DID A GO-AROUND AND THE CAPTAIN AND FIRST OFFICER RAN THROUGH THE PROCEDURES IN THE HANDBOOK. THE FLIGHT THEN MADE THE APPROACH AND LANDED WITHOUT INCIDENT. THE BRAKES FUNCTIONED PROPERLY. MAINTENANCE REPLACED BRAKE CONTROL MODULE NR 2. CHECKS OK.